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Trying to identify a leak

Old Oct 25, 2021 | 10:01 PM
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Trying to identify a leak

It’s below the manifold and close to the turbo, I’m not sure where it’s at and need some help identifying it, thank you! Pic/vid
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Old Oct 25, 2021 | 11:56 PM
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Found this online and it looks like the same spot as the one I sent before, I believe the leak is coming from that black part
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Old Oct 26, 2021 | 03:58 AM
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The black part you outlined in your pic is the front iron. The leak wouldn't be coming from there.

Are you able to let us know what type of leak you are experiencing? Air, Oil, Fuel?

If it's from your Lower Inlet Manifold, the only fluid it can leak is fuel.
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Old Oct 26, 2021 | 06:30 AM
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Originally Posted by Axton
The black part you outlined in your pic is the front iron. The leak wouldn't be coming from there.

Are you able to let us know what type of leak you are experiencing? Air, Oil, Fuel?

If it's from your Lower Inlet Manifold, the only fluid it can leak is fuel.
Ill double check later on after work to see if I can find out what type of leak, But I asked the builder and he said if I’m running rich then it’s probably fuel and PO did say the car is currently running rich
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Old Oct 26, 2021 | 11:09 AM
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Wipe it clean with a white paper towel (no water, no cleaner) then take a close look at the paper towel to see what you've got. Fuel smells like fuel, oil feels like oil, and coolant smells like coolant. Try looking under the intake manifold also, in case you're seeing something that started near the primary injectors and leaked down through an improperly sealed lower intake manifold gasket. After you get a sample of the fluid, get the area as clean as possible (especially up high) so you can see where the leak starts.

If it's a fuel leak, don't even turn the engine on. You can run the fuel pump with the engine off to find fuel leaks. I haven't heard an 'RX7 burns to the ground' story lately, but there have been a handful of posts on the forums over the years. Carry a fire extinguisher in your car, if you haven't already got one.

You might have some communication or misunderstanding problems with the builder. Running rich should make soot in the muffler and will turn your sparkplugs black, it shouldn't drip raw fuel outside of the intake manifold. A harness problem or failed injector might dump enough raw fuel to cause a leak, but the engine would run one just one rotor and sound like a helicopter.
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Old Oct 26, 2021 | 03:40 PM
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You can test for fuel leaks by pressurizing the fuel system. The FSm has the procedure. Typically, you connect the Fuel Pump and ground on the Diagnostics box using a wire or paper clip.

To test for coolant leaks, you use a Coolant System Pressure tester. I've posted about that in the past if you want to search my posts.
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Old Oct 26, 2021 | 07:00 PM
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Originally Posted by scotty305
Wipe it clean with a white paper towel (no water, no cleaner) then take a close look at the paper towel to see what you've got. Fuel smells like fuel, oil feels like oil, and coolant smells like coolant. Try looking under the intake manifold also, in case you're seeing something that started near the primary injectors and leaked down through an improperly sealed lower intake manifold gasket. After you get a sample of the fluid, get the area as clean as possible (especially up high) so you can see where the leak starts.

If it's a fuel leak, don't even turn the engine on. You can run the fuel pump with the engine off to find fuel leaks. I haven't heard an 'RX7 burns to the ground' story lately, but there have been a handful of posts on the forums over the years. Carry a fire extinguisher in your car, if you haven't already got one.

You might have some communication or misunderstanding problems with the builder. Running rich should make soot in the muffler and will turn your sparkplugs black, it shouldn't drip raw fuel outside of the intake manifold. A harness problem or failed injector might dump enough raw fuel to cause a leak, but the engine would run one just one rotor and sound like a helicopter.
Yeah I think I may have some miscommunication with the builder I’ll get a sample tomorrow to see what kind of leak it is, didn’t have time today, will definitely start carrying a fire extinguisher in the car now, thank you, also took a video yesterday that I didn’t upload, it does look like it’s from the lower intake manifold. Video

Originally Posted by gracer7-rx7
You can test for fuel leaks by pressurizing the fuel system. The FSm has the procedure. Typically, you connect the Fuel Pump and ground on the Diagnostics box using a wire or paper clip.

To test for coolant leaks, you use a Coolant System Pressure tester. I've posted about that in the past if you want to search my posts.
I’ll check out the post for the coolant system pressure tester and will look into the fuel system soon when I get the time, thank you very much!
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Old Oct 27, 2021 | 11:22 AM
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Nothing runs through the intake manifold on the FD, FYI, but the Fuel Pulsation Dampener, fuel injectors, oil injectors and some small coolant hoses are on the other side of the LIM on top of the engine and I suppose a leak from any of them could make its way to that area.
Additionally, the OMP and turbo oil and coolant lines are in front of that area and any leaks from there can wind up on the exhaust manifold from the air blowing through the engine bay while driving.
Lots of things to check
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